Homepage Established in 1958, Unidoor Corporation is a leader in the art of manufacturing interior doors and millwork. We strive to be innovative in the ever-changing field of wood products. Our point-to-point Established in 1958, Unidoor Corporation is a leader in the art of manufacturing interior doors and millwork. We strive to be innovative in the ever-changing field of wood products. Our point-to-point grading system insures the highest quality products, while a solid team of dedicated employees take pride in both quality and safety.